KR101977807B1 - Method for anodizing surface treatment of automotive sunroof rails - Google Patents

Abstract

An embodiment of the present invention relates to an anodizing surface treatment process of a vehicle sunroof rail and, more specifically, to a process of increasing corrosion resistance, decorativeness, wear resistance, and aesthetic effects of a material by forming an oxide film on a surface of an aluminum product through an anodizing treatment method.

Description

[0001] The present invention relates to an anodizing surface treatment of automotive sunroof rails,

TECHNICAL FIELD The present invention relates to a process for anodizing a surface of a rail of a vehicle sunroof, and more particularly, to a technical feature for providing a high-quality anodizing surface treatment process at a low cost through a simple surface treatment process for reducing work time will be.

Anodizing is also called anodic oxidation. When an electrolytic solution of a metal or a component is applied to an anode and a dilute-acid electrolytic solution is used, an anodic oxide having a great adhesion with the base metal is formed by oxygen generated from the anode. . Anodic oxidation is a compound of anode and oxidation, which differs from electroplating in that metal parts are plated on a negative electrode.

 The most representative materials of the anode are aluminum (Al), and the anodizing treatment is also applied to metallic materials such as magnesium (Mg), zinc (Zn), titanium (Ti), tantalum (Ta), hafnium (Hf), and niobium In recent years, anodizing treatment of magnesium and titanium materials is also increasingly used.

Such an anodizing process is used for various purposes to obtain an oxide film by electrolyzing an electrolyte solution on a metal or a product and oxygen generated from the anode to obtain corrosion prevention, scratch relief, and a beautiful coating. In particular, magnesium alloys have many excellent properties, while magnesium alloys are highly active metals, so they are susceptible to both alkali and acid problems and corrosion is easily caused. In addition, in the conventional anodizing technique, the magnesium surface treatment liquid is mostly composed of an acid component such as sodium sulfate, sodium nitrate, potassium sulfate, potassium nitrate, etc., thus posing a risk of environmental pollution.

Korean Registered Patent No. 10-1205498 (issued Nov. 21, 2012)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to reduce an environmental pollution by carrying out an anodizing surface treatment through a proper proportion of a small amount of alkali chemicals, , A reduction in the working time and a reduction in the production cost.

According to a first aspect of the present invention, there is provided a method for manufacturing an automotive vehicle, comprising: spraying a cleaning liquid containing a mixture of an alkaline solution and a cleaning liquid on a surface of a sunroof rail for a vehicle; It is possible to provide a degreasing process for removing oil or contaminants adsorbed on the surface of the sunroof rail.

By the start of work, a first water washing step using a surface of a vehicle sun roof rail subjected to the degreasing process the washing water of 80 ℃ injected at a pressure of less than 1.6 kg / cm ² at least 2.5 kg / cm ² for washing with water for 2 minutes Can be provided.

A mixed gas obtained by mixing oxygen gas and argon gas was injected into the sunroof rail for a vehicle which had undergone the first water washing process at a pressure of 80 mTorr or more and 670 mTorr or less and a high frequency power of 50 to 60 MHz was injected for 10 minutes It is possible to provide an etching process for flattening the surface of the automotive sunroof ale and removing the oxide.

A second water washing step of washing the surface of the sunroof rail subjected to the etching process for 2 minutes by using a washing water at 20 ° C sprayed at a pressure of not less than 1.6 kg / cm ^{2 and not} more than 2.5 kg / cm ² Can be provided.

A composition for treating dismutate which comprises 1 to 60% by weight of hydrogen peroxide, 5 to 15% by weight of sulfuric acid, 1 to 15% by weight of an iron compound and 0.5 to 10% by weight of an ammonium compound, It is possible to provide a desmutting step of performing the desmutting for 1 to 2 minutes under the condition of room temperature to 50 占 폚.

By the start of work, by using the display gamut process the rough washing water of 80 ℃ injected surface for a vehicle sun roof rail at a pressure of less than 1.6 kg / cm ² at least 2.5 kg / cm ² the third washing to washing with water for 1 minute Process can be provided.

A member made of an aluminum alloy was loaded into an electrolytic bath containing an electrolytic solution at 20 ° C, and then a high-frequency pulse current having a square pulse waveform of a period of 10 ms to 25 ms was applied for 40 to 60 minutes, A film forming process for forming an aluminum oxide film of 5 to 15 mu m can be provided.

A fourth water washing step in which the surface of the sunroof rail for a vehicle which has undergone the film forming process is rinsed for one minute with rinse water at 20 ° C sprayed at a pressure of 1.6 or more and 2.5 or less can be provided.

In order to fill an oxide film formed on the surface of a vehicle sunroof rail with a dye, a coloring agent at 55 DEG C containing an inorganic compound or a water-soluble organic dye is treated in a metal surface for 8 to 10 minutes to provide a dye A coloring step for coloring can be provided.

In order to prevent scattering of the coloring agent on the surface of the sunroof rail that has undergone the coloring process by the initiation of the process, it is preferable to add 10 to 150 g / l of ammonium chromate at 20 to 25 占 폚 containing 10 to 50 g / l of sodium dichromate It is possible to provide a sealing process of immersing the mixed aqueous solution for a predetermined time.

It is possible to provide a fifth water washing step of washing the surface of the sunroof rail, which has undergone the sealing process, at a temperature of 80 캜, which is sprayed at a pressure of not less than 1.6 and not more than 2.5, for one minute by using washing water.

It is possible to provide an ion washing step of washing the ionized water with an ultrasonic vibrator at a temperature of 50 to 60 DEG C by ultrasonic waves of 30 to 35 kHz.

It is possible to provide a drying step of spraying air at 80 to 90 DEG C at an air velocity of 50 m / s or more and 60 m / s or less until the surface of the sunroof rail subjected to the ion washing process is completely removed, .

According to the second embodiment, in the film forming step, the electrolytic solution contained in the electrolytic bath is prepared by adding 3 to 45 g / L of ammonium monophosphate, 15 to 20 g / L of phosphoric acid and 10 to 45 g / L of aluminum sulfate And a control unit for controlling the display unit.

The present invention provides a process for preventing scattering and elution of a colored liquid distributed in a metal surface by gradually closing holes on a porous surface so that a colored liquid and a coloring agent do not elute on the porous surface of Al ₂ O ₃ The surface treatment process can be performed efficiently.

 By virtue of this disclosure, the present invention was invented using accurate proportions of drug and precise time, and it is possible to make low cost, high efficiency anodizing surface treatment possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing an anodizing surface treatment process of a sunroof rail for a vehicle according to one embodiment; FIG.
FIG. 2 is a photograph showing a surface enlarged cross-sectional view of an aluminum alloy product treated with an anodized film electrolytic solution for an aluminum alloy product according to the present invention.
3 is a chart comparing the hardness of an aluminum alloy made by an anodizing process according to the present invention.
Fig. 4 is a graph showing the hardness (VHN) among the mechanical properties of the aluminum alloy specimen according to one embodiment.
FIG. 5 is a table in which an anodizing quality is evaluated and recorded according to the material and conditions according to the first embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Also, in order to clearly illustrate the present invention in the drawings, portions not related to the present invention are omitted, and the same or similar reference numerals denote the same or similar components.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the objects and effects of the present invention are not limited only by the following description.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing an anodizing surface treatment process of a sunroof rail for a vehicle according to one embodiment; FIG.

In block 101, a cleaning liquid mixed with an alkaline solution and a cleaning liquid is sprayed onto the surface of the vehicle sunroof rail by one start, and a brush containing silicon carbide (SiC) A degreasing process for removing oil or contaminants adsorbed on the surface of the loop rail can be provided.

In block 102 by the start of work, by using the surface of a vehicle sun roof rail subjected to the degreasing process the washing water of 80 ℃ injected at a pressure of less than 1.6 kg / cm ² at least 2.5 kg / cm ² for washing with water for 2 minutes, the 1 < / RTI > wash process.

In block 103, a mixed gas obtained by mixing oxygen gas and argon gas is injected into the sunroof rail for a vehicle that has undergone the first washing step by a starting operation at a pressure of 80 mTorr or more and 670 mTorr or less to generate a high frequency power of 50 to 60 MHz Minute injection to planarize the surface of the vehicle sunroof ale, and to provide an etching process for removing the oxide.

The etching process is a process for improving the texture of the surface state subjected to the sanding treatment to improve the pit (black dot) peculiar to the material 70 after fine polishing and chemical polishing and to remove afterimage of the CNC process. This process consists of immersing the substrate in a concentration of 50-200 g / L of acidic ammonium fluoride at room temperature to 100 ° C for 10 seconds to 3 minutes.

At block 104, the surface of the sunroof rail of the vehicle that has undergone the etching process is rinsed for 2 minutes by using a washing water at 20 ° C sprayed at a pressure of 1.6 kg / cm ² to 2.5 kg / cm ² 2 water washing process can be provided.

In block 105, a composition for dismantling treatment comprising 1 to 60 wt% of hydrogen peroxide, 5 to 15 wt% of sulfuric acid, 1 to 15 wt% of iron compound, and 0.5 to 10 wt% of ammonium compound To perform a desmutting process for 1 to 2 minutes under the condition of room temperature to 50 占 폚.

The dismut process is a process for removing smut produced by impurities on the surface of a workpiece after etching and chemical polishing. The dismutting process, which is carried out only by chemical immersion, increases the removal time and can damage the resin bonded to the metal. In order to improve this, the present invention includes a step of performing ultrasonic desmutting at a concentration of 5 to 10% of sulfuric acid and 1 to 5% of hydrogen peroxide at a temperature of from room temperature to 50 캜 for 20 seconds to 2 minutes.

The cleaning of the product and the rack by washing in the pretreatment process by the initiation of the operation is performed, but the clearance of the rack or the surface of the product causes the residual of fine acid / alkali to cause stain failure in the coating process The additional step is a step of neutralizing the surface of the product by dipping it at a concentration of 1 to 10% sodium hydrogencarbonate at a room temperature to 50 ° C for 10 seconds to 1 minute.

Block 106 in the by start day, using the washing water of 80 ℃ injected surface for a vehicle sun roof rail via the display gamut process at a pressure of at least ^{1.6 kg / cm 2 2.5 kg /} cm 2 or less to water washing for 1 minute A third water washing step can be provided.

In block 107, a member made of an aluminum alloy is loaded into an electrolytic bath containing an electrolytic solution at 20 ° C by an initial start, and then a high-frequency pulse current having a square pulse waveform of 10 ms to 25 ms is applied for 40 to 60 minutes, Forming a 5 to 15 탆 aluminum oxide film on the surface of the substrate.

According to another disclosure, the film-forming process, that is, the anodizing process, can form a film having a pretreated product at a voltage of 12V to 18V with the product as an anode under a condition of 10-15% sulfuric acid and a bath temperature of 15-25 ° C.

In block 108, by a single start, the surface of the sunroof rail for a vehicle that has undergone the film-forming step can be provided with a fourth rinsing step of rinsing the rinsing water for 1 minute by using rinsing water at 20 ° C sprayed at a pressure of 1.6 to 2.5 have.

In block 109, a 55 ° C coloring agent containing an inorganic compound or a water-soluble organic dye is treated in the metal surface for 8 to 10 minutes in order to fill the oxide coating formed on the surface of the vehicle sunroof rail with the dye by coloring Thereby providing a coloring step for coloring the dye.

In block 110, in order to prevent scattering of the coloring agent on the surface of the sunroof rail of the vehicle that has undergone the coloring process by one start, it is preferable that 10 to 150 g / l of ammonium chromate is added to 20 to 50 g / l of sodium dichromate to 10 to 50 g / It is possible to provide a sealing process of immersing in a mixed aqueous solution at 25 캜 for a predetermined time.

In Block 111, the surface of the sunroof rail that has undergone the sealing process is subjected to a fifth rinsing step at a temperature of 80 캜, which is sprayed at a pressure of 1.6 or more and 2.5 or less, for 1 minute by using cleansing water .

In block 112, by an initial start, it is possible to provide an ion washing step of washing with an ultrasonic wave of 30 to 35 kHz to an ionized water bath having a temperature of 50 to 60 DEG C provided with an ultrasonic vibrator.

At block 113, a drying process is performed in which air at 80 to 90 ° C is sprayed at an air velocity of 50 m / s or more and 60 m / s or less until the water on the surface of the sunroof rail for the vehicle that has been subjected to the ion washing process is completely removed can do.

In the film forming step, the electrolytic solution contained in the electrolytic bath contains 3 to 45 g / l of ammonium monophosphate, 15 to 20 g / l of phosphoric acid and 10 to 45 g / l of aluminum sulfate in a solution containing 25% by weight of sulfuric acid can do.

By the initiation of the operation, the degreasing step can be repeated until the residual carbon amount of the vehicle sunroof rail becomes 25 mg / m ² or less. By virtue of the initiation, the amount of residual carbon can be sensed through a carbon check module.

According to another disclosure, in the degreasing step, a negative electrode electrolytic degreasing step for degassing the negative electrode for 20 to 30 minutes at ⁸ to 9 A / dm ² using a stainless steel plate as a positive electrode at a temperature of 70 to 80 ° C And the like.

The sunroof rail for a vehicle comprises 0.2 to 0.3% by weight of Fe, 6.0 to 7.0% by weight of zinc, 1.5 to 2.5% by weight of magnesium, 0.01 to 0.6% by weight of copper, (Si), manganese (Mn), chromium (Cr) and titanium (Ti) are included in the aluminum alloy, and silicon (Si), manganese ), Chromium (Cr) and titanium (Ti) does not exceed 0.3% by weight based on the total weight of the aluminum alloy.

(Fe ₂ O ₁₂ S _3, Ferric sulfate), iron naphthenate (2 (C ₁₁ H ₇ O 2) Fe, Fe ₂ O ₃ S _, Fe ₂ O ₃ ) iron Naphthenate), iron citrate _{(C 6 H 5 FeO 7,} iron citrate), iron oxide _{(Fe 2 O 3, iron oxide} ), iron carbonyl _{(Fe (CO) 5, iron} carbonyl), ferric oxalate (C _{6 Fe 2 O 12 5 (H} 2 O), Ferric Oxalate), iron acetate _{(2 (C 2 H 3 O} 2) Fe, iron acetate), ferrous lactate _{(5 O 2 (C 3 H} 3) Fe, iron Lactate), Iron P-Toluene Sulfonate Hexahydrate (C ₇ H ₇ O ₃ S) ₃ Fe 6 (H ₂ O), Iron p-Toluenesulfonate Hexahydrate), Iron Gluconate (C ₁₂ H ₂₂ FeO ₁₄ , Iron Gluconate) iron acetylacetonate _{(C 15 H 21 FeO 6,} iron acetylacetonate), ammonium ferrous sulfate _{(FeNH 4 (SO 4) 2} , ammonium iron sulfate), iron nitrate quinoa hydrate _{(Fe (NO 3) 3 9} (H 2 O ), Iron Nitrate Nonahydrate), Iron Phosphate Dihydrate Sites _{(FePO 4 2 (H 2 O} ), Iron Phosphate Dihydrate), iron chloride hexahydrate _{(FeCl 3 6 (H 2 O} ), Iron Chloride Hexahydrate) and iron pyrophosphate _{(Fe 4 (P 2 O 7} ) 3, Iron Pyrophosphate), and mixtures thereof.

The ammonium compound may be ammonium formate (NH ₄ CHO ₂ , ammonium formate), ammonium nitrate (NH ₄ NO ₃ ), ammonium sulfate ((NH ₄ ) ₂ SO ₄ , ammonium sulfate, (H ₈ N ₂ S, Ammonium Sulfide), Ammonium Adipate (C ₆ H ₁₆ N ₂ O ₄ ), Ammonium Fluoride (NH ₄ F), Ammonium Chloride (NH ₄ Cl) , tetraethyl ammonium acetate _{(C 8 H 20 NC 2 H} 3 O 2, tetraethylammonium acetate), ammonium hexafluorotitanate silicate _{((NH 4) 2 SiF 6} , ammonium hexafluorosilicate), tetrapropyl ammonium bisulfate (C ₁₂ H ₂₈ NHSO ₄ Tetrapropyl Ammonium Bisulfate), tetrabutylammonium perchlorate (C ₁₆ H ₃₆ NClO ₄ , Tetrabutyl Ammonium Perchlorate), ammonium hydroxide (H ₅ NO), ammonium acetate (C ₂ H ₇ NO ₂ , Ammonium Acetate) ammonium hydrogen sulfate (NH ₄ HSO _4, ammonium Hydr (NH ₄ H ₂ PO ₂ , Ammonium Phosphinate), ammonium hydrogen maleate (C ₄ H ₇ NO ₄ ), ammonium benzoate (C ₇ H ₉ NO ₂ , Ammonium Benzoate, ammonia bifluoride (NH ₄ HF ₂ ), and ammonium oxalate (C ₂ H ₈ N ₂ O ₄ , ammonia oxalate).

By the initiation of the film forming process, the film forming process can provide a process of masking a part of the top surface of the vehicle sunroof rail.

It is also possible to provide a step of forming a film on a non-masked portion of the upper surface of the vehicle sunroof rail to form a pattern of a predetermined shape.

Further, it is possible to provide a process of removing the masking from the upper surface of the vehicle front rail rail on which the pattern is formed.

FIG. 2 is a photograph showing a surface enlarged cross-sectional view of an aluminum alloy product treated with an anodized film electrolytic solution for an aluminum alloy product according to the present invention.

The electrolytic solution used in the anodizing method according to the present invention is a solution for coating an oxide film on a surface of a case, a plate, or the like, which is a product made of an aluminum alloy material, and a stainless steel or a Pt- When an aluminum alloy product is connected to the anode and then electricity is applied, oxygen in the electrolyte reacts with the anode aluminum, which forms an aluminum oxide (Al ₂ O ₃ ) oxide layer on the surface layer of the aluminum product.

In the present invention, sulfuric acid (H ₂ SO ₄ ), ammonium monophosphate (NH ₄ H ₂ PO ₄ ) and phosphoric acid (Na ₃ PO ₄ ) are mixed based on the weight of water, Potassium (KH ₂ PO ₄ ) may be further mixed.

In particular, the present invention is sulfuric acid to water by weight, based on _{(H 2 SO 4) 1 ~} 20 parts by weight of one ammonium phosphate _{(NH 4 H 2 PO 4)} 1 ~ 5 parts by weight of a phosphate _{(Na 3 PO 4) 1 ~} 25 Are mixed with water, and 0.1 to 10 parts by weight of potassium dihydrogen phosphate (KH ₂ PO ₄ ) is further mixed as necessary.

Here, the sulfuric acid (H ₂ SO ₄ ) is a substance that forms the basis of the formation of the aluminum oxide oxide film, and 1 to 20 parts by weight based on the weight of water is mixed with water. When mixing is carried out at less than 1 part by weight, It may cause an increase in time, and if it is mixed more than 20 parts by weight, the denseness may be lowered due to the corrosion of the oxide film.

For reference, the sulfuric acid (H ₂ SO ₄ ) is a colorless liquid compound with high density and corrosiveness. It is made of sulfur or sulfur compounds, water and oxygen as raw materials, and forms in combination with calcium, magnesium and other elements It is widely present in nature and has a strong affinity for water and acts as a powerful dehydrating agent.

They are also useful as electrolytes, strong oxidants, solvents, catalysts, dilute sulfuric acid solutions used to control acidity and basicity, and various concentrations of fuming sulfuric acid used in the production of pharmaceuticals, dyes and explosives. Diluted sulfuric acid reacts with metals such as zinc, magnesium and iron to generate hydrogen, and concentrated sulfuric acid obtains volatile acids from the salt, and is used to convert calcium phosphate into water-soluble phosphate for fertilizer, And two dissociated ions through two steps.

The one-ammonium phosphate (NH ₄ H ₂ PO ₄₎ is when containing less than a material to increase the compactness of the oxide film, and one or by water by weight based on 5 parts by weight of the bar to be mixed in water, 1 part by weight of increasing the denseness of the oxide film And if it is contained in an amount of more than 5 parts by weight, more than 5 parts by weight becomes unnecessary in the condition of improving the compactness.

Additionally, as a one ammonium phosphate (NH ₄ H ₂ PO ₄₎ is a white crystal, is stable in air and soluble in water and ethyl alcohol, when heated above 190 ℃ is condensed, releasing water and ammonia, the holding process (dye (Woody), yeast culture agent, antioxidant, antioxidant, antioxidant, antioxidant, antiseptic agent, dispersant), ABC powder extinguisher, It is used for the growth of yeast, fermentation enhancement, fermentation food.

Phosphoric acid (Na ₃ PO ₄ ) serves as an electrolytic catalyst for aluminum (Al) and oxygen (O), and 1 to 25 parts by weight of water is mixed in water, and if it is contained in an amount smaller than 1 part by weight It is insufficient to serve as an electrolytic catalyst for aluminum (Al) and oxygen (O), and if it contains more than 25 parts by weight, unnecessary phosphate is generated.

For reference, phosphoric acid (H ₃ PO ₄ ) is used as fertilizer in phosphate form, as well as in dental cement, albumin derivative, sugar and textile industry, and is used to produce sour taste and fruit flavor in food. Pure phosphoric acid is a colorless syrup-like liquid in a crystalline state (melting point 42.35 ° C), and unpurified acid is obtained in a phosphate rock. Phosphoric acid is substituted by 1, 2 or 3 hydrogen atoms in different elements (NaH ₂ PO ₄ ), which is used to control the pH of the solution (acidity), and phosphoric acid, which is used as a precipitant of polyvalent metal in water You can make disodium hydrogen (Na ₂ HPO ₄ ), tin phosphate (Na ₃ PO ₄ ) used as a soap and detergent.

The potassium dihydrogenphosphate (KH ₂ PO ₄ ) serves to fuse sulfuric acid (H ₂ SO ₄ ), ammonium monophosphate (NH ₄ H ₂ PO ₄ ) and phosphoric acid (Na ₃ PO ₄ ) If it is contained in an amount of less than 0.1 part by weight, it is insufficient in the fusing role of the substance. If it is contained in an amount of more than 10 parts by weight, undesirable salt may be generated, It can have an adverse effect.

For reference, potassium dihydrogenphosphate (KH ₂ PO ₄ ) is a white or colorless crystal, readily soluble in water, used in the manufacture of medicines, foodstuffs and sodium metaphosphate, and used in the manufacture of highly effective composite fertilizers in agriculture Can be used as a raw material for containing N, P, K3 elements having a content of nutrients (P ₂ O ₅ + K ₂ O) of 86% and can be used as fertilizers, food additives, It is a water-soluble salt.

In the processing of other meat products and dairy products, it should be used with potassium hydrogen phosphate as stabilizer and buffer. It is also used as raw material of expanding agent raw material (acid) and noodle-added alkali agent, and it softens and disperses in hard water.

The composition of the anodized film electrolytic solution for an aluminum alloy product according to the present invention can be surface-treated with a metal product at a voltage of 15 to 30 V by an anode coating method. As shown in FIG. 2, An oxide film having a thickness of 8 to 45 mu m is formed on the surface at a treatment time of 30 minutes or less.

3 is a chart comparing the hardness of an aluminum alloy material using an anodizing process according to the present invention.

Fig. 4 is a graph showing the hardness (VHN) among the mechanical properties of the aluminum alloy specimen according to one embodiment.

In detail, the aluminum alloy material 30 mm (0.6 mm) was degreased with acetone by ultrasonic degreasing, and 5% by weight of hydroxide Etch to sodium. Thereafter, the nitric acid was removed from the smut, and electrolytic polishing was carried out for 1 minute at 10 A / dm 2 in an electrolytic polishing solution having a ratio of phosphoric acid: sulfuric acid: water of 7: 2: 1.

Thereafter, an electrolytic bath containing an electrolyte containing 17 to 55 g / L of citric acid and 10 to 55 g / L of aluminum sulfate was added to a solution of 10 to 25 wt% of sulfuric acid at a current density of 2 to 6 A / And anodic oxidation was carried out at a temperature of 2 to 20 ° C for 30 minutes.

As can be seen from FIGS. 3 and 4, when the period of the high-frequency pulse is 10 sec to 30 sec and the duty cycle is in the range of 60% to 80%, the hardness of the aluminum alloy material is 315 to 370 VHN, which is the highest.

Therefore, in the anodizing process using the high-frequency pulse of the present invention, the period of the high-frequency pulse crossing the polarity at a constant cycle so that the concentration of the sulfate ion (SO42-), which is an anion dissolving action in the oxide layer, To 30 msec and the duty cycle is in the range of 60% to 80%, the overvoltage caused by the electric double layer can be lowered to suppress the dissolution action of the oxide layer and form a solid oxide layer. Therefore, the surface hardness of the aluminum alloy can be improved, and mechanical properties such as abrasion resistance and corrosion resistance can be improved.

FIG. 5 is a table in which an anodizing quality is evaluated and recorded according to the material and conditions according to the first embodiment.

In Examples 1 to 4, aluminum alloys were produced in accordance with a conventional aluminum alloy manufacturing method as shown in FIG. 5 in the amounts of aluminum, zinc, magnesium, copper, silicon, iron, manganese, chromium and titanium, (YTS), tensile strength (UTS) and elongation (El) were measured and the anodizing quality was evaluated and shown in FIG.

Comparative Examples 1 and 2 used A6061 T6 and A7075 T6, respectively, without separate manufacture (see FIG. 5). The contents and the heat treatment conditions, yield strength, tensile strength and elongation of the steel sheet were the same as those recorded in the database of FIG. 5, and the anodizing quality was separately evaluated and shown in FIG.

In Comparative Example 3, aluminum alloys were produced in accordance with a conventional aluminum alloy manufacturing method as shown in FIG. 5, in terms of amounts of aluminum, zinc, magnesium, copper, silicon, iron, manganese, chromium and titanium, YTS), tensile strength (UTS) and elongation (El) were measured and the anodizing quality was evaluated and presented.

As a result, when the content of copper (Cu) was 1.2% or more (Comparative Examples 2 and 3), the gloss was lowered in anodizing, and other samples having a small copper content were found to have good quality.

Further, it can be seen that the T6 treatment results in excellent physical properties. In Example 4, both T5 and T6 achieve a yield strength of 400 MPa or more, which is 1.5 times higher than that of the conventional 6000 series aluminum alloy. .

As described above, the steel material satisfying the conditions of the present invention, in which the scale layer is formed on the surface of the base steel, can exhibit excellent temporal rust prevention properties under severe atmospheric corrosion environments.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. Should be regarded as belonging to the above-mentioned patent claims.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept as defined by the appended claims. But is not limited thereto.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

Claims (7)

A cleaning liquid mixed with an alkaline liquid and a cleaning liquid is sprayed onto the surface of a vehicle sunroof rail, and a brush containing silicon carbide (SiC) grinding stone for 25 minutes at a temperature of 50 ° C is used to A degreasing process for removing oil or contaminants;
A first washing step of rinsing the surface of the sunroof rail of the vehicle that has been subjected to the degreasing step for 2 minutes using a washing water at 80 ° C sprayed at a pressure of 1.6 kg / cm ² to 2.5 kg / cm ² ;
A mixed gas obtained by mixing oxygen gas and argon gas was injected into the sunroof rail for the vehicle subjected to the first water washing step at a pressure of 80 mTorr or more and 670 mTorr or less and high frequency power of 50 to 60 MHz was injected for 10 minutes, An etching process for planarizing the surface of the ale and removing the oxide;
A second rinsing step of rinsing the surface of the sunroof rail of the vehicle that has been subjected to the etching process for 2 minutes using rinsing water at 20 ° C sprayed at a pressure of 1.6 kg / cm ² or more and 2.5 kg / cm ² or less;
The composition for treating dismutate, which comprises 1 to 60 wt% of hydrogen peroxide, 5 to 15 wt% of sulfuric acid, 1 to 15 wt% of an iron compound, and 0.5 to 10 wt% of an ammonium compound, A desmutting step of performing the desmutting for 1 to 2 minutes under the condition;
A third rinsing step of rinsing the surface of the sunroof rail of the vehicle that has been subjected to the desmutting step for one minute using rinsing water at 80 캜 sprayed at a pressure of 1.6 kg / cm ² or more and 2.5 kg / cm ² or less;
A member made of an aluminum alloy is loaded on an electrolytic bath containing an electrolytic solution at 20 캜 and a high frequency pulse current of a square pulse waveform having a period of 10 ms to 25 ms is applied for 40 to 60 minutes to a surface of the above- A film forming step of forming an aluminum oxide film of aluminum oxide;
A fourth rinsing step of rinsing the surface of the sunroof rail of the vehicle that has undergone the film forming process for one minute using rinsing water at 20 ° C sprayed at a pressure of 1.6 or more and 2.5 or less;
In order to fill the oxide coating formed on the surface of the vehicle front rail by coloring, a coloring agent at 55 ° C containing an inorganic compound or a water-soluble organic dye is treated in the metal surface for 8 to 10 minutes to color the dye ;
In order to prevent the scattering of the coloring agent on the surface of the vehicle sunroof rail after passing through the coloring step, it is preferable to add 10 to 150 g / l of ammonium chromate in a mixed aqueous solution of 20 to 25 캜 containing 10 to 50 g / l of sodium dichromate A sealing step of immersing for a period of time;
A fifth rinsing step of rinsing the surface of the sunroof rail for the vehicle through the sealing process at a temperature of 80 캜 at a pressure of 1.6 to 2.5,
An ion-washing step of washing with an ultrasonic wave of 30 to 35 kHz to an ionized water bath having a temperature of 50 to 60 ° C equipped with an ultrasonic vibrator;
And a drying step of spraying air at 80 to 90 DEG C at an air velocity of not less than 50 m / s and not more than 60 m / s until moisture on the surface of the vehicle front rail rail subjected to the ion-washing step is completely removed, Of the anodizing surface treatment process. The method according to claim 1,
In the film forming step,
Characterized in that the electrolytic solution contained in the electrolytic bath contains 3 to 45 g / l of ammonium monophosphate, 15 to 20 g / l of phosphoric acid and 10 to 45 g / l of aluminum sulfate in a solution of 25% by weight of sulfuric acid. Of the anodizing surface treatment process. The method according to claim 1,
In the degreasing step,
Is repeated until the residual carbon amount of the vehicle front rail rail becomes 25 mg / m < ² > or less. The method according to claim 1,
In the degreasing step,
characterized in that it can be replaced by a negative electrode electrolytic degreasing step in which the negative electrode is electrolytically degreased at ⁸ to 9 A / dm ² for 20 to 30 minutes using a stainless steel plate as an anode at a temperature of 70 to 80 캜 in an alkaline solution having a pH of 12 or more. Anodizing surface treatment process of loop rail. delete The method according to claim 1,
The desmutting composition according to claim 1,
The iron-based compound is selected from the group consisting of ferric sulfate (Fe ₂ O ₁₂ S _3, ferric sulfate), iron naphthenate (2 (C ₁₁ H ₇ O 2) Fe, iron naphthenate), iron citrate (C ₆ H ₅ FeO ₇ , Iron Citrate ), Iron oxide (Fe ₂ O ₃ ) _, iron carbonyl (Fe (CO) ₅ , iron carbonyl), ferric oxalate (C ₆ Fe ₂ O ₁₂ 5 (H ₂ O) acetate _{(2 (C 2 H 3 O} 2) Fe, iron acetate), ferrous lactate _{(2 (C 3 H 5 O} 3) Fe, iron lactate), iron P- toluenesulfonate hexahydrate (C ₇ H ₇ O _{3 S) 3 Fe6 (H 2} O), iron p-Toluenesulfonate Hexahydrate), ferrous gluconate _{(C 12 H 22 FeO 14,} iron gluconate), iron acetylacetonate _{(C 15 H 21 FeO 6,} iron acetylacetonate), ammonium ferrous sulfate _{(FeNH 4 (SO 4) 2} , Ammonium iron sulfate), iron nitrate quinoa hydrate _{(Fe (NO 3) 3 9} (H 2 O), iron nitrate Nonahydrate), iron phosphate dihydrate (FePO ₄ 2 (H ₂ O), Iron Phosphate Dihydrate), iron chloride hexahydrate (Fe And iron pyrophosphate (Fe ₄ (P ₂ O ₇ ) ₃ , iron pyrophosphate), and iron pyrophosphate (Fe ₃ (H ₂ O)
The ammonium compound may be at least one selected from the group consisting of ammonium formate (NH ₄ CHO ₂ , ammonium formate), ammonium nitrate (NH ₄ NO ₃ ), ammonium sulfate ((NH ₄ ) ₂ SO ₄ , ammonium sulfate, H ₂ N ₂ S, Ammonium Sulfide), ammonium adipate (C ₆ H ₁₆ N ₂ O ₄ , ammonium adipate), ammonium fluoride (NH ₄ F), ammonium chloride (NH ₄ Cl) tetraethylammonium acetate _{(C 8 H 20 NC 2 H} 3 O 2, tetraethylammonium acetate), ammonium hexafluorotitanate silicate _{((NH 4) 2 SiF 6} , ammonium hexafluorosilicate), tetrapropyl ammonium bisulfate (C ₁₂ H ₂₈ NHSO _4, Tetrapropyl Ammonium Bisulfate), tetrabutylammonium perchlorate (C ₁₆ H ₃₆ NClO ₄ , Tetrabutyl Ammonium Perchlorate), ammonium hydroxide (H ₅ NO, Ammonium Hydroxide), ammonium acetate (C ₂ H ₇ NO ₂ , Ammonium Acetate) Hydrogen sulfates (NH ₄ HSO ₄ , Ammonium Hydro (NH ₄ H ₂ PO ₂ , Ammonium Phosphinate), ammonium hydrogen maleate (C ₄ H ₇ NO ₄ ), ammonium benzoate (C ₇ H ₉ NO ₂ , Ammonium Benzoate), ammonium bi-fluoride _{(NH 4 HF 2, ammonium Bifluoride} ) and ammonium oxalate _{(C 2 H 8 N 2 O} 4, ammonium oxalate) , which in characterized in that the selected at least two or more kinds of mixture groups, consisting of a vehicle Anodizing surface treatment of sunroof rail. The method according to claim 1,
In the film forming step,
Masking a part of a top surface of the vehicle front rail rail;
Forming a coating on an unmasked portion of an upper surface of the vehicle front rail rail to form a pattern of a predetermined shape; And
And removing the masking from the top surface of the patterned vehicle sunroof rail.

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